Thomsen L, Eilenberg J
Department of Ecology, The Royal Veterinary and Agricultural University, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark.
J Invertebr Pathol. 2000 Aug;76(2):127-30. doi: 10.1006/jipa.2000.4961.
The formation in vivo of Entomophthora muscae resting spores was investigated in the host, Delia radicum (cabbage root fly), by analysis of field data on the seasonal occurrence of E. muscae resting spores over 4 years. E. muscae resting spores in D. radicum were spherical with an average diameter of 39.4 microm, and the average numbers produced were estimated at 5.7 x 10(4) resting spores/female cadaver. Resting spores were found only after midsummer in D. radicum and almost exclusively in females. The proportion of infected females with resting spores was negatively correlated with average weekly day length after midsummer. We did not detect any significant year effect; thus, the results support the hypothesis that the photoperiod is the most important abiotic factor controlling E. muscae resting spore formation in D. radicum.
通过分析4年里关于蝇虫霉休眠孢子季节性出现的田间数据，对其在宿主萝卜地种蝇体内休眠孢子的形成进行了研究。萝卜地种蝇体内的蝇虫霉休眠孢子呈球形，平均直径为39.4微米，估计每只雌蝇尸体产生的休眠孢子平均数为5.7×10⁴个。在萝卜地种蝇中，休眠孢子仅在仲夏之后出现，且几乎只出现在雌蝇体内。仲夏之后，带有休眠孢子的受感染雌蝇比例与平均每周日照时长呈负相关。我们未检测到任何显著的年份效应；因此，这些结果支持了以下假说：光周期是控制萝卜地种蝇体内蝇虫霉休眠孢子形成的最重要非生物因素。
